In Japan, summertime is the time for festivals. While most major summer festivals involve fireworks (fireworks seem to be synonymous with summer), there are many smaller festivals that barely count as festivals by the typical Japanese standard. Smaller festivals usually focus around specific interest groups or cultures. This was a Thai Fruit Festival in West Ikebukuro Park. It was mostly food booths and a couple grocery store-like shops, with a couple performers on the stage who were largely ignored.
That's not to say that these aren't great festivals; they are great, but they are largely ignored because they aren't part of the mainstream culture here.